He has worked mainly in Paris, Los Angeles and several other countries as an artist in residence. In 2012 he returned to the Mediterranean with the installation of workshops in Roussillon (French Catalonia).

His first exhibition was in 1982, since then, his work has been collected privately as well as by galleries and museums globally.

There have been several commissions from the French government, among them, the Embassies in Singapore and Baku (Azerbaijan), The Department of Foreign Affairs and Liberté-Égalité-Fraternité ordered for the OECD in Paris.

He has also done commercial work: Lefranc & Bourgeois, the good market (painted bags, public facility, and the monumental bronze "the purveyor" at the entrance to the store), Champagne Nicolas Feuillatte (creation of labels, paintings, greeting cards, posters, objets...), Champagne JACQUART, Haut-Canteloup Castle (creation of a label for Medoc)... Guy Ferrer has also designed a number of book covers for Francophones, Mobydick and J.E. Flower.

His major work "T.O.L.É.R.A.N.C.E" created in reaction to contemporary humanist religious tensions uses nine letters / characters suggestive of various cults of the world. Edited in eight rounds, some of them are installed in France, Germany, Poland and the United Arab Emirates.

In 2014, his work was shown in Johannesburg (South Africa), Beirut (Lebanon), Xiamen, Beijing (China), as well as to Annecy, Perpignan, Aix en Provence and Saint-Ouen (France).